If you read the linked Washington Post article, they mention that the 370 NM camera is for the the low-resolution camera. In the article, they brag that it was the then widest angle reconnaissance camera. The high-resolution, and therefore narrow field, camera had a resolution of 2' 6". There is also a description of a counter-rotating optic system, which would indicate to me that they were using a scanning-style panoramic camera yielding a much larger film area than 24mm x 36mm.
If I had to guess (with no particular expertise on the subject), I bet they were using something more like extra long rolls of 120 (6cm wide) roll film.